Adjustable wrench head



FIG. 1 is a perspective view of an adjustable wrench head showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left view thereof;

FIG. 5 is a right view thereof; and,

FIG. 6 is a top view thereof.

The broken lines depict portions of the adjustable wrench head that form no part of the claimed design. 

CLAIM The ornamental design for an adjustable wrench head, as shown and described. 